Can a Broadcom single-port 200G network adapter be configured to support 1-to-2 or 1-to-4 breakout output modes

Q： Can a Broadcom single-port 200G network adapter be configured to support 1-to-2 or 1-to-4 breakout output modes

A：Yes. You can configure port breakout modes either via the BIOS Setup Utility (recommended) or using the Broadcom ”niccli” Command-Line Tool within the operating system if BIOS options are unavailable.

Method 1: Configuring Breakout Mode via BIOS Setup (Recommended)

1. Access Broadcom NIC Settings:

• Enter the BIOS Setup Utility and navigate to the Advanced tab.
• Select your Broadcom NIC (e.g., Broadcom NetXtreme E-Series Single-port 200Gb OCP 3.0 Ethernet Adapter) and press Enter. (Note: The exact menu location may vary depending on the BIOS version.)
  

2. Open Device Configuration:

• Select Device Configuration Menu and press Enter.

3. Configure Port Operation Mode:

• Select Port Operation Mode.
• Choose Breakout 1 port to 2 or Breakout 1 port to 4 based on your setup requirements.

4. Save Settings:

• Navigate to the Save & Exit menu, select Save Changes (or press F4), and exit BIOS.

5. Cold Reboot & Verification:

• Power off the system completely (cold reboot) and turn it back on.
• Re-enter BIOS > Advanced and check if the expected MAC addresses for each breakout port are displayed correctly

Method 2: Configuring Breakout Mode via Broadcom niccli Tool

If the BIOS menu does not provide breakout settings, use the official Broadcom niccli tool in your OS environment.

1. Download the Tool:

• Download niccli for Windows/Linux from the official Broadcom support website.
  

2. Locate the Adapter:

• Open Command Prompt or Terminal with Administrator / Root privileges.
• Navigate to the niccli directory and list available network adapters: niccli_x64.exe –list
• Identify your Broadcom adapter index from the list (e.g., Index 1 for BCM57508).

3. Set Port Operation Mode:

Execute the following command to set the breakout mode (replace -i 1 with your adapter index):

• niccli_x64.exe -i 1 nvm --setoption port_operation_mode --value 9

• Value 8: Breakout 1 to 2
• Value 9: Breakout 1 to 4

• After the command completes successfully, power off the system completely (cold boot) to apply the configuration.

4. Verify Configuration:

• Boot back into the OS, open Command Prompt (as Administrator), and run:
• niccli_x64.exe -i 1 nvm --getoption port_operation_mode 
• Confirm that the command returns:
• port_operation_mode = breakout 1-to-4 (or breakout 1-to-2).